Source : Webster's Revised Unabridged Dictionary (1913)

Cystolith \Cys"to*lith\ (s?s"t?-l?th), n. [Gr. ???? bladder +
   -lith.]
   1. (Bot.) A concretion of mineral matter within a leaf or
      other part of a plant.

   2. (Med.) A urinary calculus.

Source : WordNet®

cystolith
     n : a calculus formed in the bladder [syn: {bladder stone}]